A parabolic mirror to be used in a searchlight measures 40 centimeters tall
and 80 centimeters wide. It's light bulb
needs to be placed at the focus for the light
to magnify properly. Find the distance from
the vertex to the bulb.
Hint: Assume the parabola opens
downward and has its vertex at the origin.
PLEASE HELP

answer: (x)+4-5=-3

step-by-step explanation:

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.